MySQL query to perform delete operation where id is the biggest?

You can use ORDER BY DESC command with LIMIT 1 for this since we need to delete only a single ID.

Let us first create a table −

mysql> create table DemoTable (    UserId int,    UserName varchar(20) ); Query OK, 0 rows affected (0.57 sec)

Insert records in the table using insert command −

mysql> insert into DemoTable values(100,'John'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(234,'Mike'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable values(145,'Sam'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(278,'Carol'); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values(289,'David'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(277,'Bob'); Query OK, 1 row affected (0.14 sec)

Display records from the table using select command −

mysql> select *from DemoTable;

This will produce the following output −

+--------+----------+ | UserId | UserName | +--------+----------+ | 100 | John | | 234 | Mike | | 145 | Sam | | 278 | Carol | | 289 | David | | 277 | Bob | +--------+----------+ 6 rows in set (0.00 sec)

Following is the query to perform delete where id is the biggest −

mysql> delete from DemoTable order by UserId DESC limit 1; Query OK, 1 row affected (0.15 sec)

Let us display all records from the table in order to check the biggest id has been deleted or not. Here, id 289 deleted successfully −

mysql> select *from DemoTable;

This will produce the following output −

+--------+----------+ | UserId | UserName | +--------+----------+ | 100 | John | | 234 | Mike | | 145 | Sam | | 278 | Carol | | 277 | Bob | +--------+----------+ 5 rows in set (0.00 sec)